What Does Three-Layer Extruded Polyethylene Coating (3LPE) Mean?

A three-layer extruded polyethylene coating (3LPE) is composed of extruded, three-layer, anti-corrosive steel pipe coatings. A few layers in this kind of coating include:

Bonding agent or copolymer layer
Epoxy layer
Polypropylene or polyethylene layer

Corrosionpedia Explains Three-Layer Extruded Polyethylene Coating (3LPE)

A three-layer extruded polyethylene coating is used for a number of types of pipelines including sewer systems, water pipelines, gas pipelines and also other channels which can be dangerous to water. Polyethylene coatings come in use to safeguard buried pipelines from corroding since 1950s. This kind of coating provides higher potential to deal with insulation than bitumen coatings.

A three-layer extruded polyethylene coating does apply through sight extrusion and sleeve extrusion. These ways of applying polyethylene coating were introduced from the 1960s, replacing the sintering technique. It turned out from the 1980s when 3LPE became very prevalent in the industry.

One benefit of this coating material is it is ultra-adhesive, even at room temperature. Also, it may be easily reduce as necessary insurance firms the pipelines heated. Furthermore, this material carries a very strong chemical resistance that means it is applicable even just in essentially the most aggressive environments, including all forms of soil.

Mit resistance of this coating prevents its corrosion. However, it must be noted that just like many materials, it is usually vulnerable to some types of corrosion. For that reason, as early as 1974, testing has become necessary to determine the fermentation or corrosion resistance of 3LPE. This really is conducted by measuring the temperature with the use of a thermometer at 140°F (60°C). The measure of aging will be the melt index, which is set within an initial value of 25%. Through the years, heightened testing methods are already developed to determine the 3LPE’s aging and effectiveness against corrosion.

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